body {
    background-color: black;
}

.container {
    background-color: black;
}

.panel-body {
    background-color: silver;
}

.panel-default>.panel-heading {
    background-color: slategray;
}

.help {
    text-align: justify;
}

.counter {
    transition: opacity 0.5s ease 0s;
    opacity: 0;
}

.counting {
    animation: counting 10s linear 0.5s 1 forwards;
}

#bar {
    width: 100%;
}

.show {
    opacity: 1 !important;
}

@keyframes counting {
    from {
        width: 100%;
    }
    to {
        width: 0;
        background-color: red;
    }
}